﻿using System;

namespace ConsoleApp4
{
    public abstract class Student
    {
        public int id;
        private readonly string name = "22";
        internal static int age = 16;
        protected string major = "22娘";
    }

    public sealed class Student2
    {
        public readonly string name = "33";
        internal static int age = 16;

    }

    public sealed class Student3
    {
        public int id;
        private static readonly string name = "可";
        internal static int age = 20;
    }

    internal abstract class Teacher
    {
        public int id;
        private readonly string name = "非";
        internal static int age = 26;
        protected string major = "法家";
    }

    internal sealed class Teacher2
    {
        public int id;
        private readonly string name = "良";
        internal static int age = 17;

    }




}
